Can you use forms within PHP echo? - php

Question

I'm trying to echo a form from within an echo statement in my PHP code, everything works except for the submit button, when I click it, it just takes me to the same page I'm in instead of purchase.php
It works when I copy the form out of PHP and use paste it in plain html but that doesn't serve what I need, why would the action of a form not work in a PHP echo?
I tried using escape characters for the quotations, starting a completely fresh echo statement, seperated it from the others, nothing worked, I keep getting redirected to the same page like it's an empty submit button
if($_POST['SELECTION'] == "sony"){
$data=mysqli_query($conn,"SELECT * FROM products where prod_type = 'sony' ");
while($row=mysqli_fetch_assoc($data)){
echo"
<div class='w3-quarter'>
<img src='".$row['img_link']."' width='200px' height='300px' alt='iphone12' style='width:100%'>
<h3>".$row['prod_name']."</h3>
<p>".$row['prod_desc']."</p>
<p>".$row['prod_price']."</p>
<p>". "<form method='POST' action='purchase.php'> <div id = 'hidden' > <input type ='text' name='ninjaid' value='".$row['prod_id']."' > </div> <input type='submit' name='buy' value='Buy'> </form>"." </p>
";
}

Answer 1

use single quote on the outside and double quotes inside working
fine
echo '
<div class="w3-quarter">
<img src="'.$row['img_link'].'" width="200px" height="300px" alt="iphone12" style="width:100%">
<h3>"'.$row['prod_name'].'"</h3>
<p>"'.$row['prod_desc'].'"</p>
<p>"'.$row['prod_price'].'"</p>
<p><form method="POST" action="purchase.php"> <div id = "hidden" > <input type ="text" name="ninjaid" value="'.$row['prod_id'].'" > </div> <input type="submit" name="buy" value="Buy"> </form></p>';

Answer 2

Use curly braces to enclose variables {$var} instead ."$var". to avoid problems with arrays
if($_POST['SELECTION'] == "sony"){
$data=mysqli_query($conn,"SELECT * FROM products where prod_type = 'sony' ");
while($row=mysqli_fetch_assoc($data)){
echo"
<div class='w3-quarter'>
<img src='{$row['img_link']}' width='200px' height='300px' alt='iphone12' style='width:100%'>
<h3>{$row['prod_name']}</h3>
<p>{$row['prod_desc']}</p>
<p>{$row['prod_price']}</p>
<p><form method='POST' action='purchase.php'> <div id = 'hidden' > <input type ='text' name='ninjaid' value='{$row['prod_id']}' > </div> <input type='submit' name='buy' value='Buy'> </form>"." </p>
";
}